York Regional Road 99 Permanent Closure

York Regional Road 99 will be permanently closed between Highway 7 and Zenway Boulevard in the Northbound and Southbound directions to permit the construction of the Highway 427 Expansion project. The Highway 427 Expansion project will extend the highway 6.6 km, from Highway 7 to Major Mackenzie Drive and widen the existing highway to 8 lanes between Finch Avenue and Highway 7.
On August 8, 2020, LINK427 will permanently close to the travelling public York Regional Road 99 between Highway 7 and Zenway Boulevard so that the Highway 427 Extension between Highway 7 and Major Mackenzie Drive can be constructed in its place. There will no longer be any access to Zenway Boulevard from Highway 427.
A traffic analysis was completed prior to the closure. Traffic flow will be monitored after the closure to ensure that affected roadways are performing as optimally as possible. Please visit the project website (www.427expansion.ca) for up-to-date information about traffic impacts for the permanent closure of York Regional Road 99 and other project works.

General FAQs

Ontario has selected LINK427 to design, build, finance and maintain the Highway 427 Expansion project. The Highway 427 Expansion includes the following:
  • A new 6.6 km extension from Highway 7 to Major Mackenzie Drive with:
    • eight lanes from Highway 7 to Rutherford Road;
    • six lanes from Rutherford Road to Major Mackenzie Drive;
    • three new interchanges (Langstaff Road, Rutherford Road and Major Mackenzie
    • Drive);
    • new median managed lanes.
  • A 4.0 km road widening from Finch Avenue to Highway 7:
    • from six to eight lanes between Finch Avenue to south of Steeles Avenue;
    • from four to eight lanes, from south of Steeles Avenue to Highway 7;
    • new median managed lanes.
Also, provisions (i.e., gantry footings, electrical and communication conduits, and electrical boxes) to facilitate future implementation of Managed (High-Occupancy Vehicle [HOV]) Lanes.
LINK427 was selected to undertake the extension and widening of Highway 427 by the Ontario Ministry of Transportation (MTO) and Infrastructure Ontario (IO). LINK427 is led by a team of local and international designers and constructors with a proven track record in delivering best-in-class transportation infrastructure. The LINK427 team includes:
  • Developer: ACS Infrastructure Canada Inc. and Brennan Infrastructures Inc. (a member of the Miller Group of Companies)
  • Construction: Dragados Canada Inc., Brennan Infrastructures Inc. and Bot Infrastructure Ltd.
  • Design: WSP
  • Maintenance: ACS Infrastructure Canada Inc. and Brennan Infrastructures Inc.
LINK427 signed a $616-million fixed-price contract with the Ministry of Transportation (MTO) and Infrastructure Ontario (IO) to design, build, finance and maintain the Highway 427 Expansion project.
LINK427 has established a “one-window” communication channel to address any questions, comments or issues. Contact us at ask@427expansion.ca or 1-888-595-3152. Visit the project website at 427expansion.ca or fr.427expansion.ca for more details about LINK427 and the Highway 427 Expansion Project.
The project is on track to open in 2021. All three new interchanges at Langstaff Road, Rutherford Road, and Major Mackenzie Drive will open at the same time. They are indicated by blue pins in the map below.

LINK427 considers how our activities affect local traffic and communities, provide advance notice of all temporary and permanent road closures and lane reductions and always strive to be mindful of reducing the impacts of construction. Updates about all temporary and permanent road closures and lane reductions are posted on the traffic disruptions page.
The Highway 427 Transportation Corridor Environmental Assessment (EA) received approval from the Ministry of Environment and Climate Change (MOECC) in November 2010. The project was updated through completion of a Transportation Environmental Study Report (TESR) in 2016 to add additional lanes to the proposed Highway 427 extension. A separate TESR was completed in 2013 for the widening of existing Highway 427 between Albion Road to Highway 7. This project is being carried out in accordance with the approved environmental planning process for Group ‘A’ projects under the MTO Class Environmental Assessment (Class EA) for Provincial Transportation Facilities (2000).
Design and Construction Reports outline the project process, design details, results of the consultation process, construction staging and environmental impacts and mitigation measures. Each DCR for the Highway 427 Expansion project was made available for a 30-day public and agency review period. DCR notices were published in local newspapers, on the Project website and distributed by mail to those on the project contact list advising of the start of each review period and locations where each DCR will be available for review. All DCRs prepared for the project can be viewed here.
Managed lanes are lanes within a highway that have different rules from the general-purpose lanes. Managed lanes intend to optimize the efficiency of the highway system and provide greater travel time reliability for commuters. High-Occupancy Vehicle (HOV) lanes aim to manage traffic congestion by providing dedicated lanes for transit buses and carpools carrying two or more occupants. For more information about managed lanes, please visit the Ministry of Transportation’s website at http://www.mto.gov.on.ca/english/ontario-511/hov-lanes.shtml.
Details such as opening timelines of the managed lanes on the Highway 427 Expansion are still being determined and will be communicated closer to the opening of the Expansion.
Plans for highway expansion north of Major Mackenzie Drive (such as to Highway 9, Alliston, Barrie, and other points north of Vaughan) are beyond the scope of this project and subject to provincial assessment and approval. To share comments or feedback on highway expansion or extension projects, we encourage you to contact the Ministry of Transportation at http://www.mto.gov.on.ca/english/about/contact-us.shtml.
No, there will no longer be access to Highway 427 from Zenway Boulevard. Motorists will need to use the nearby Highway 7 or Langstaff Road interchanges.
The Highway 427 Expansion will not feature a collector-express lane configuration. All exits will be accessible from the general lanes in both the northbound and southbound directions.
LINK427 provides all the required mitigation measures to prevent offsite tracking of mud, dirt and rocks from migrating off the construction site onto local roads to the extent possible. Measures include mud mats at the construction entrance and exit points and we also conduct many sweeps per day with a sweeper truck where we are working. During the winter, LINK427 is not permitted to use water in our sweeper trucks as it would potentially cause dangerous icy conditions for motorists.